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<h1 id="firstHeading" class="firstHeading"><span style="font-size:0.7em; line-height:130%">std::num_get&lt;CharT,InputIt&gt;::</span>get, <span style="font-size:0.7em; line-height:130%">std::num_get&lt;CharT,InputIt&gt;::</span>do_get</h1>
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<tr class="t-nv-h2"><td colspan="5"> 编码转换平面</td></tr>
<tr class="t-nv-col-table"><td><div><table class="t-nv-begin" cellpadding="0" style="">
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="../codecvt_utf8.html" title="cpp/locale/codecvt utf8"><span class="t-lines"><span>codecvt_utf8</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="../codecvt_utf16.html" title="cpp/locale/codecvt utf16"><span class="t-lines"><span>codecvt_utf16</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div></div></td></tr>
</table></div></td><td><div><table class="t-nv-begin" cellpadding="0" style="">
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="../codecvt_utf8_utf16.html" title="cpp/locale/codecvt utf8 utf16"><span class="t-lines"><span>codecvt_utf8_utf16</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="../codecvt_mode.html" title="cpp/locale/codecvt mode"><span class="t-lines"><span>codecvt_mode</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div></div></td></tr>
</table></div></td></tr>
<tr class="t-nv-h2"><td colspan="5"> C 本地环境</td></tr>
<tr class="t-nv-col-table"><td><div><table class="t-nv-begin" cellpadding="0" style="">
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="../setlocale.html" title="cpp/locale/setlocale"><span class="t-lines"><span>setlocale</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="../localeconv.html" title="cpp/locale/localeconv"><span class="t-lines"><span>localeconv</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="../lconv.html" title="cpp/locale/lconv"><span class="t-lines"><span>lconv</span></span></a></div></div></td></tr>
</table></div></td><td><div><table class="t-nv-begin" cellpadding="0" style="">
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="../LC_categories.html" title="cpp/locale/LC categories"><span class="t-lines"><span>LC_ALL</span><span>LC_COLLATE</span><span>LC_CTYPE</span><span>LC_MONETARY</span><span>LC_NUMERIC</span><span>LC_TIME</span></span></a></div></div></td></tr>
</table></div></td></tr>
</table></div><div></div></div></div></div><div class="t-navbar-sep"> </div><div class="t-navbar-head"><a href="../num_get.html" title="cpp/locale/num get"><tt>std::num_get</tt></a><div class="t-navbar-menu"><div><div><table class="t-nv-begin" cellpadding="0" style="">
<tr class="t-nv-h2"><td colspan="5">成员函数</td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="num_get.html" title="cpp/locale/num get/num get"><span class="t-lines"><span>num_get::num_get</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="~num_get.html" title="cpp/locale/num get/~num get"><span class="t-lines"><span>num_get::~num_get</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><strong class="selflink"><span class="t-lines"><span>num_get::get</span><span>num_get::do_get</span></span></strong></div></div></td></tr>
</table></div><div></div></div></div></div><div class="t-navbar-sep"> </div></div>
<table class="t-dcl-begin"><tbody>
</tbody>
<tbody class="t-dcl-rev t-dcl-rev-num"><tr class="t-dcl-rev-aux">
<td></td>
<td rowspan="142">(1)</td>
<td></td>
</tr>
<tr class="t-dcl">
<td class="t-dcl-nopad"> <div><span class="mw-geshi cpp source-cpp"><span class="kw1">public</span><span class="sy4">:</span><br>
<p>iter_type get<span class="br0">(</span> iter_type in, iter_type end, <a href="../../io/ios_base.html"><span class="kw1669">std::<span class="me2">ios_base</span></span></a><span class="sy3">&amp;</span> str, <br>
</p>
               <a href="../../io/ios_base/iostate.html"><span class="kw1697">std::<span class="me2">ios_base</span><span class="sy4">::</span><span class="me2">iostate</span></span></a><span class="sy3">&amp;</span> err, <span class="kw4">bool</span><span class="sy3">&amp;</span> v <span class="br0">)</span> <span class="kw4">const</span><span class="sy4">;</span></span></div></td>
<td class="t-dcl-nopad">  </td>
<td class="t-dcl-nopad">  </td>
</tr>
<tr class="t-dcl">
<td class="t-dcl-nopad"> <div><span class="mw-geshi cpp source-cpp">iter_type get<span class="br0">(</span> iter_type in, iter_type end, <a href="../../io/ios_base.html"><span class="kw1669">std::<span class="me2">ios_base</span></span></a><span class="sy3">&amp;</span> str, <br>
               <a href="../../io/ios_base/iostate.html"><span class="kw1697">std::<span class="me2">ios_base</span><span class="sy4">::</span><span class="me2">iostate</span></span></a><span class="sy3">&amp;</span> err, <span class="kw4">long</span><span class="sy3">&amp;</span> v <span class="br0">)</span> <span class="kw4">const</span><span class="sy4">;</span></span></div></td>
<td class="t-dcl-nopad">  </td>
<td class="t-dcl-nopad">  </td>
</tr>
<tr class="t-dcl t-since-cxx11">
<td> <div><span class="mw-geshi cpp source-cpp">iter_type get<span class="br0">(</span> iter_type in, iter_type end, <a href="../../io/ios_base.html"><span class="kw1669">std::<span class="me2">ios_base</span></span></a><span class="sy3">&amp;</span> str, <br>
               <a href="../../io/ios_base/iostate.html"><span class="kw1697">std::<span class="me2">ios_base</span><span class="sy4">::</span><span class="me2">iostate</span></span></a><span class="sy3">&amp;</span> err, <span class="kw4">long</span> <span class="kw4">long</span><span class="sy3">&amp;</span> v <span class="br0">)</span> <span class="kw4">const</span><span class="sy4">;</span></span></div></td>
<td class="t-dcl-nopad">  </td>
<td> <span class="t-mark-rev t-since-cxx11">(C++11 起)</span> </td>
</tr>
<tr class="t-dcl">
<td class="t-dcl-nopad"> <div><span class="mw-geshi cpp source-cpp">iter_type get<span class="br0">(</span> iter_type in, iter_type end, <a href="../../io/ios_base.html"><span class="kw1669">std::<span class="me2">ios_base</span></span></a><span class="sy3">&amp;</span> str, <br>
               <a href="../../io/ios_base/iostate.html"><span class="kw1697">std::<span class="me2">ios_base</span><span class="sy4">::</span><span class="me2">iostate</span></span></a><span class="sy3">&amp;</span> err, <span class="kw4">unsigned</span> <span class="kw4">short</span><span class="sy3">&amp;</span> v <span class="br0">)</span> <span class="kw4">const</span><span class="sy4">;</span></span></div></td>
<td class="t-dcl-nopad">  </td>
<td class="t-dcl-nopad">  </td>
</tr>
<tr class="t-dcl">
<td class="t-dcl-nopad"> <div><span class="mw-geshi cpp source-cpp">iter_type get<span class="br0">(</span> iter_type in, iter_type end, <a href="../../io/ios_base.html"><span class="kw1669">std::<span class="me2">ios_base</span></span></a><span class="sy3">&amp;</span> str, <br>
               <a href="../../io/ios_base/iostate.html"><span class="kw1697">std::<span class="me2">ios_base</span><span class="sy4">::</span><span class="me2">iostate</span></span></a><span class="sy3">&amp;</span> err, <span class="kw4">unsigned</span> <span class="kw4">int</span><span class="sy3">&amp;</span> v <span class="br0">)</span> <span class="kw4">const</span><span class="sy4">;</span></span></div></td>
<td class="t-dcl-nopad">  </td>
<td class="t-dcl-nopad">  </td>
</tr>
<tr class="t-dcl">
<td class="t-dcl-nopad"> <div><span class="mw-geshi cpp source-cpp">iter_type get<span class="br0">(</span> iter_type in, iter_type end, <a href="../../io/ios_base.html"><span class="kw1669">std::<span class="me2">ios_base</span></span></a><span class="sy3">&amp;</span> str, <br>
               <a href="../../io/ios_base/iostate.html"><span class="kw1697">std::<span class="me2">ios_base</span><span class="sy4">::</span><span class="me2">iostate</span></span></a><span class="sy3">&amp;</span> err, <span class="kw4">unsigned</span> <span class="kw4">long</span><span class="sy3">&amp;</span> v <span class="br0">)</span> <span class="kw4">const</span><span class="sy4">;</span></span></div></td>
<td class="t-dcl-nopad">  </td>
<td class="t-dcl-nopad">  </td>
</tr>
<tr class="t-dcl t-since-cxx11">
<td> <div><span class="mw-geshi cpp source-cpp">iter_type get<span class="br0">(</span> iter_type in, iter_type end, <a href="../../io/ios_base.html"><span class="kw1669">std::<span class="me2">ios_base</span></span></a><span class="sy3">&amp;</span> str, <br>
               <a href="../../io/ios_base/iostate.html"><span class="kw1697">std::<span class="me2">ios_base</span><span class="sy4">::</span><span class="me2">iostate</span></span></a><span class="sy3">&amp;</span> err, <span class="kw4">unsigned</span> <span class="kw4">long</span> <span class="kw4">long</span><span class="sy3">&amp;</span> v <span class="br0">)</span> <span class="kw4">const</span><span class="sy4">;</span></span></div></td>
<td class="t-dcl-nopad">  </td>
<td> <span class="t-mark-rev t-since-cxx11">(C++11 起)</span> </td>
</tr>
<tr class="t-dcl">
<td class="t-dcl-nopad"> <div><span class="mw-geshi cpp source-cpp">iter_type get<span class="br0">(</span> iter_type in, iter_type end, <a href="../../io/ios_base.html"><span class="kw1669">std::<span class="me2">ios_base</span></span></a><span class="sy3">&amp;</span> str, <br>
               <a href="../../io/ios_base/iostate.html"><span class="kw1697">std::<span class="me2">ios_base</span><span class="sy4">::</span><span class="me2">iostate</span></span></a><span class="sy3">&amp;</span> err, <span class="kw4">float</span><span class="sy3">&amp;</span> v <span class="br0">)</span> <span class="kw4">const</span><span class="sy4">;</span></span></div></td>
<td class="t-dcl-nopad">  </td>
<td class="t-dcl-nopad">  </td>
</tr>
<tr class="t-dcl">
<td class="t-dcl-nopad"> <div><span class="mw-geshi cpp source-cpp">iter_type get<span class="br0">(</span> iter_type in, iter_type end, <a href="../../io/ios_base.html"><span class="kw1669">std::<span class="me2">ios_base</span></span></a><span class="sy3">&amp;</span> str, <br>
               <a href="../../io/ios_base/iostate.html"><span class="kw1697">std::<span class="me2">ios_base</span><span class="sy4">::</span><span class="me2">iostate</span></span></a><span class="sy3">&amp;</span> err, <span class="kw4">double</span><span class="sy3">&amp;</span> v <span class="br0">)</span> <span class="kw4">const</span><span class="sy4">;</span></span></div></td>
<td class="t-dcl-nopad">  </td>
<td class="t-dcl-nopad">  </td>
</tr>
<tr class="t-dcl">
<td class="t-dcl-nopad"> <div><span class="mw-geshi cpp source-cpp">iter_type get<span class="br0">(</span> iter_type in, iter_type end, <a href="../../io/ios_base.html"><span class="kw1669">std::<span class="me2">ios_base</span></span></a><span class="sy3">&amp;</span> str, <br>
               <a href="../../io/ios_base/iostate.html"><span class="kw1697">std::<span class="me2">ios_base</span><span class="sy4">::</span><span class="me2">iostate</span></span></a><span class="sy3">&amp;</span> err, <span class="kw4">long</span> <span class="kw4">double</span><span class="sy3">&amp;</span> v <span class="br0">)</span> <span class="kw4">const</span><span class="sy4">;</span></span></div></td>
<td class="t-dcl-nopad">  </td>
<td class="t-dcl-nopad">  </td>
</tr>
<tr class="t-dcl">
<td class="t-dcl-nopad"> <div><span class="mw-geshi cpp source-cpp">iter_type get<span class="br0">(</span> iter_type in, iter_type end, <a href="../../io/ios_base.html"><span class="kw1669">std::<span class="me2">ios_base</span></span></a><span class="sy3">&amp;</span> str, <br>
               <a href="../../io/ios_base/iostate.html"><span class="kw1697">std::<span class="me2">ios_base</span><span class="sy4">::</span><span class="me2">iostate</span></span></a><span class="sy3">&amp;</span> err, <span class="kw4">void</span><span class="sy2">*</span><span class="sy3">&amp;</span> v <span class="br0">)</span> <span class="kw4">const</span><span class="sy4">;</span></span></div></td>
<td class="t-dcl-nopad">  </td>
<td class="t-dcl-nopad">  </td>
</tr>
</tbody><tbody>
</tbody>
<tbody class="t-dcl-rev t-dcl-rev-num"><tr class="t-dcl-rev-aux">
<td></td>
<td rowspan="142">(2)</td>
<td></td>
</tr>
<tr class="t-dcl">
<td class="t-dcl-nopad"> <div><span class="mw-geshi cpp source-cpp"><span class="kw1">protected</span><span class="sy4">:</span><br>
<p><span class="kw1">virtual</span> iter_type do_get<span class="br0">(</span> iter_type in, iter_type end, <a href="../../io/ios_base.html"><span class="kw1669">std::<span class="me2">ios_base</span></span></a><span class="sy3">&amp;</span> str, <br>
</p>
                          <a href="../../io/ios_base/iostate.html"><span class="kw1697">std::<span class="me2">ios_base</span><span class="sy4">::</span><span class="me2">iostate</span></span></a><span class="sy3">&amp;</span> err, <span class="kw4">bool</span><span class="sy3">&amp;</span> v <span class="br0">)</span> <span class="kw4">const</span><span class="sy4">;</span></span></div></td>
<td class="t-dcl-nopad">  </td>
<td class="t-dcl-nopad">  </td>
</tr>
<tr class="t-dcl">
<td class="t-dcl-nopad"> <div><span class="mw-geshi cpp source-cpp"><span class="kw1">virtual</span> iter_type do_get<span class="br0">(</span> iter_type in, iter_type end, <a href="../../io/ios_base.html"><span class="kw1669">std::<span class="me2">ios_base</span></span></a><span class="sy3">&amp;</span> str, <br>
                          <a href="../../io/ios_base/iostate.html"><span class="kw1697">std::<span class="me2">ios_base</span><span class="sy4">::</span><span class="me2">iostate</span></span></a><span class="sy3">&amp;</span> err, <span class="kw4">long</span><span class="sy3">&amp;</span> v <span class="br0">)</span> <span class="kw4">const</span><span class="sy4">;</span></span></div></td>
<td class="t-dcl-nopad">  </td>
<td class="t-dcl-nopad">  </td>
</tr>
<tr class="t-dcl t-since-cxx11">
<td> <div><span class="mw-geshi cpp source-cpp"><span class="kw1">virtual</span> iter_type do_get<span class="br0">(</span> iter_type in, iter_type end, <a href="../../io/ios_base.html"><span class="kw1669">std::<span class="me2">ios_base</span></span></a><span class="sy3">&amp;</span> str, <br>
                          <a href="../../io/ios_base/iostate.html"><span class="kw1697">std::<span class="me2">ios_base</span><span class="sy4">::</span><span class="me2">iostate</span></span></a><span class="sy3">&amp;</span> err, <span class="kw4">long</span> <span class="kw4">long</span><span class="sy3">&amp;</span> v <span class="br0">)</span> <span class="kw4">const</span><span class="sy4">;</span></span></div></td>
<td class="t-dcl-nopad">  </td>
<td> <span class="t-mark-rev t-since-cxx11">(C++11 起)</span> </td>
</tr>
<tr class="t-dcl">
<td class="t-dcl-nopad"> <div><span class="mw-geshi cpp source-cpp"><span class="kw1">virtual</span> iter_type do_get<span class="br0">(</span> iter_type in, iter_type end, <a href="../../io/ios_base.html"><span class="kw1669">std::<span class="me2">ios_base</span></span></a><span class="sy3">&amp;</span> str, <br>
                          <a href="../../io/ios_base/iostate.html"><span class="kw1697">std::<span class="me2">ios_base</span><span class="sy4">::</span><span class="me2">iostate</span></span></a><span class="sy3">&amp;</span> err, <span class="kw4">unsigned</span> <span class="kw4">short</span><span class="sy3">&amp;</span> v <span class="br0">)</span> <span class="kw4">const</span><span class="sy4">;</span></span></div></td>
<td class="t-dcl-nopad">  </td>
<td class="t-dcl-nopad">  </td>
</tr>
<tr class="t-dcl">
<td class="t-dcl-nopad"> <div><span class="mw-geshi cpp source-cpp"><span class="kw1">virtual</span> iter_type do_get<span class="br0">(</span> iter_type in, iter_type end, <a href="../../io/ios_base.html"><span class="kw1669">std::<span class="me2">ios_base</span></span></a><span class="sy3">&amp;</span> str, <br>
                          <a href="../../io/ios_base/iostate.html"><span class="kw1697">std::<span class="me2">ios_base</span><span class="sy4">::</span><span class="me2">iostate</span></span></a><span class="sy3">&amp;</span> err, <span class="kw4">unsigned</span> <span class="kw4">int</span><span class="sy3">&amp;</span> v <span class="br0">)</span> <span class="kw4">const</span><span class="sy4">;</span></span></div></td>
<td class="t-dcl-nopad">  </td>
<td class="t-dcl-nopad">  </td>
</tr>
<tr class="t-dcl">
<td class="t-dcl-nopad"> <div><span class="mw-geshi cpp source-cpp"><span class="kw1">virtual</span> iter_type do_get<span class="br0">(</span> iter_type in, iter_type end, <a href="../../io/ios_base.html"><span class="kw1669">std::<span class="me2">ios_base</span></span></a><span class="sy3">&amp;</span> str, <br>
                          <a href="../../io/ios_base/iostate.html"><span class="kw1697">std::<span class="me2">ios_base</span><span class="sy4">::</span><span class="me2">iostate</span></span></a><span class="sy3">&amp;</span> err, <span class="kw4">unsigned</span> <span class="kw4">long</span><span class="sy3">&amp;</span> v <span class="br0">)</span> <span class="kw4">const</span><span class="sy4">;</span></span></div></td>
<td class="t-dcl-nopad">  </td>
<td class="t-dcl-nopad">  </td>
</tr>
<tr class="t-dcl t-since-cxx11">
<td> <div><span class="mw-geshi cpp source-cpp"><span class="kw1">virtual</span> iter_type do_get<span class="br0">(</span> iter_type in, iter_type end, <a href="../../io/ios_base.html"><span class="kw1669">std::<span class="me2">ios_base</span></span></a><span class="sy3">&amp;</span> str, <br>
                          <a href="../../io/ios_base/iostate.html"><span class="kw1697">std::<span class="me2">ios_base</span><span class="sy4">::</span><span class="me2">iostate</span></span></a><span class="sy3">&amp;</span> err, <span class="kw4">unsigned</span> <span class="kw4">long</span> <span class="kw4">long</span><span class="sy3">&amp;</span> v <span class="br0">)</span> <span class="kw4">const</span><span class="sy4">;</span></span></div></td>
<td class="t-dcl-nopad">  </td>
<td> <span class="t-mark-rev t-since-cxx11">(C++11 起)</span> </td>
</tr>
<tr class="t-dcl">
<td class="t-dcl-nopad"> <div><span class="mw-geshi cpp source-cpp"><span class="kw1">virtual</span> iter_type do_get<span class="br0">(</span> iter_type in, iter_type end, <a href="../../io/ios_base.html"><span class="kw1669">std::<span class="me2">ios_base</span></span></a><span class="sy3">&amp;</span> str, <br>
                          <a href="../../io/ios_base/iostate.html"><span class="kw1697">std::<span class="me2">ios_base</span><span class="sy4">::</span><span class="me2">iostate</span></span></a><span class="sy3">&amp;</span> err, <span class="kw4">float</span><span class="sy3">&amp;</span> v <span class="br0">)</span> <span class="kw4">const</span><span class="sy4">;</span></span></div></td>
<td class="t-dcl-nopad">  </td>
<td class="t-dcl-nopad">  </td>
</tr>
<tr class="t-dcl">
<td class="t-dcl-nopad"> <div><span class="mw-geshi cpp source-cpp"><span class="kw1">virtual</span> iter_type do_get<span class="br0">(</span> iter_type in, iter_type end, <a href="../../io/ios_base.html"><span class="kw1669">std::<span class="me2">ios_base</span></span></a><span class="sy3">&amp;</span> str, <br>
                          <a href="../../io/ios_base/iostate.html"><span class="kw1697">std::<span class="me2">ios_base</span><span class="sy4">::</span><span class="me2">iostate</span></span></a><span class="sy3">&amp;</span> err, <span class="kw4">double</span><span class="sy3">&amp;</span> v <span class="br0">)</span> <span class="kw4">const</span><span class="sy4">;</span></span></div></td>
<td class="t-dcl-nopad">  </td>
<td class="t-dcl-nopad">  </td>
</tr>
<tr class="t-dcl">
<td class="t-dcl-nopad"> <div><span class="mw-geshi cpp source-cpp"><span class="kw1">virtual</span> iter_type do_get<span class="br0">(</span> iter_type in, iter_type end, <a href="../../io/ios_base.html"><span class="kw1669">std::<span class="me2">ios_base</span></span></a><span class="sy3">&amp;</span> str, <br>
                          <a href="../../io/ios_base/iostate.html"><span class="kw1697">std::<span class="me2">ios_base</span><span class="sy4">::</span><span class="me2">iostate</span></span></a><span class="sy3">&amp;</span> err, <span class="kw4">long</span> <span class="kw4">double</span><span class="sy3">&amp;</span> v <span class="br0">)</span> <span class="kw4">const</span><span class="sy4">;</span></span></div></td>
<td class="t-dcl-nopad">  </td>
<td class="t-dcl-nopad">  </td>
</tr>
<tr class="t-dcl">
<td class="t-dcl-nopad"> <div><span class="mw-geshi cpp source-cpp"><span class="kw1">virtual</span> iter_type do_get<span class="br0">(</span> iter_type in, iter_type end, <a href="../../io/ios_base.html"><span class="kw1669">std::<span class="me2">ios_base</span></span></a><span class="sy3">&amp;</span> str, <br>
                          <a href="../../io/ios_base/iostate.html"><span class="kw1697">std::<span class="me2">ios_base</span><span class="sy4">::</span><span class="me2">iostate</span></span></a><span class="sy3">&amp;</span> err, <span class="kw4">void</span><span class="sy2">*</span><span class="sy3">&amp;</span> v <span class="br0">)</span> <span class="kw4">const</span><span class="sy4">;</span></span></div></td>
<td class="t-dcl-nopad">  </td>
<td class="t-dcl-nopad">  </td>
</tr>
</tbody><tbody>
<tr class="t-dcl-sep"><td></td><td></td><td></td></tr>
</tbody></table>
<div class="t-li1"><span class="t-li">1)</span> 公开成员函数，调用最终导出类的成员函数 <code>do_get</code> 。</div>
<div class="t-li1"><span class="t-li">2)</span> 从输入迭代器 <code>in</code> 读取字符，并生成 <code>v</code> 的类型的值，考虑来自 IO 流 <code>str.flags()</code> 的格式化标志，来自 <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="../use_facet.html"><span class="kw1897">std::<span class="me2">use_facet</span></span></a><span class="sy1">&lt;</span><a href="../ctype.html"><span class="kw1938">std::<span class="me2">ctype</span></span></a><span class="sy1">&lt;</span>charT<span class="sy1">&gt;&gt;</span><span class="br0">(</span>str.<span class="me1">getloc</span><span class="br0">(</span><span class="br0">)</span><span class="br0">)</span></span></span> 的字符分类规则，和来自 <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="../use_facet.html"><span class="kw1897">std::<span class="me2">use_facet</span></span></a><span class="sy1">&lt;</span><a href="../numpunct.html"><span class="kw1961">std::<span class="me2">numpunct</span></span></a><span class="sy1">&lt;</span>charT<span class="sy1">&gt;&gt;</span><span class="br0">(</span>str.<span class="me1">getloc</span><span class="br0">(</span><span class="br0">)</span><span class="br0">)</span></span></span> 的数值标点字符。此函数为所有有格式输入流运算符，如 <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="../../io/cin.html"><span class="kw1756">std::<span class="me2">cin</span></span></a> <span class="sy1">&gt;&gt;</span> n<span class="sy4">;</span></span></span> 所调用。</div>
<p>转换在三个阶段出现
</p>
<h4><span class="mw-headline" id=".E9.98.B6.E6.AE.B5_1_.EF.BC.9A.E8.BD.AC.E6.8D.A2.E8.AF.B4.E6.98.8E.E7.AC.A6.E9.80.89.E6.8B.A9">阶段 1 ：转换说明符选择</span></h4>
<ul><li> 获得 I/O 格式化标志，如同以
</li></ul>
<dl><dd> <span class="t-c"><span class="mw-geshi cpp source-cpp">fmtflags basefield <span class="sy1">=</span> <span class="br0">(</span>str.<span class="me1">flags</span><span class="br0">(</span><span class="br0">)</span> <span class="sy3">&amp;</span> <a href="../../io/ios_base/fmtflags.html"><span class="kw1682">std::<span class="me2">ios_base</span><span class="sy4">::</span><span class="me2">basefield</span></span></a><span class="br0">)</span><span class="sy4">;</span></span></span>
</dd><dd> <span class="t-c"><span class="mw-geshi cpp source-cpp">fmtflags boolalpha <span class="sy1">=</span> <span class="br0">(</span>str.<span class="me1">flags</span><span class="br0">(</span><span class="br0">)</span> <span class="sy3">&amp;</span> <a href="../../io/ios_base/fmtflags.html"><span class="kw1690">std::<span class="me2">ios_base</span><span class="sy4">::</span><span class="me2">boolalpha</span></span></a><span class="br0">)</span><span class="sy4">;</span></span></span>
</dd></dl>
<ul><li> 若 <code>v</code> 的类型为整数类型，则选择下列五个选项的首个可应用者：
</li></ul>
<dl><dd> 若 <span class="t-c"><span class="mw-geshi cpp source-cpp">basefield <span class="sy1">==</span> oct</span></span> ，则将使用转换说明符 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="sy2">%</span>o</span></span>
</dd><dd> 若 <span class="t-c"><span class="mw-geshi cpp source-cpp">basefield <span class="sy1">==</span> hex</span></span> ，则将使用转换说明符 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="sy2">%</span>X</span></span>
</dd><dd> 若 <span class="t-c"><span class="mw-geshi cpp source-cpp">basefield <span class="sy1">==</span> <span class="nu0">0</span></span></span> ，则将使用转换说明符 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="sy2">%</span>i</span></span>
</dd><dd> 若 <code>v</code> 的类型有符号，则将使用转换说明符 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="sy2">%</span>d</span></span>
</dd><dd> 若 <code>v</code> 的类型无符号，则将使用转换说明符 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="sy2">%</span>u</span></span>
</dd></dl>
<ul><li> 对于整数类型，若需要则添加长度说明符到转换说明：对于 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw4">short</span></span></span> 和 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw4">unsigned</span> <span class="kw4">short</span></span></span> 为 <span class="t-c"><span class="mw-geshi cpp source-cpp">h</span></span> ，对于 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw4">long</span></span></span> 和 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw4">unsigned</span> <span class="kw4">long</span></span></span> 为 <span class="t-c"><span class="mw-geshi cpp source-cpp">l</span></span> ，对于 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw4">long</span> <span class="kw4">long</span></span></span> 和 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw4">unsigned</span> <span class="kw4">long</span> <span class="kw4">long</span></span></span> 为 <span class="t-c"><span class="mw-geshi cpp source-cpp">ll</span></span>
</li><li> 若 <code>v</code> 的类型为 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw4">float</span></span></span> ，则将使用转换说明符 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="sy2">%</span>g</span></span>
</li><li> 若 <code>v</code> 的类型为 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw4">double</span></span></span> ，则将使用转换说明符 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="sy2">%</span>lg</span></span>
</li><li> 若 <code>v</code> 的类型为 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw4">long</span> <span class="kw4">double</span></span></span> ，则将使用转换说明符 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="sy2">%</span>Lg</span></span>
</li><li> 若 <code>v</code> 的类型为 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw4">void</span><span class="sy2">*</span></span></span> ，则将使用转换说明符 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="sy2">%</span>p</span></span>
</li><li> 若 <code>v</code> 的类型为 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw4">bool</span></span></span> 且 <span class="t-c"><span class="mw-geshi cpp source-cpp">boolalpha<span class="sy1">==</span><span class="nu0">0</span></span></span> ，则如同按 <code>v</code> 的类型为 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw4">long</span></span></span> 一般处理，除了在阶段 3 存储于 <code>v</code> 的值。
</li><li> 若 <code>v</code> 的类型为 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw4">bool</span></span></span> 且 <span class="t-c"><span class="mw-geshi cpp source-cpp">boolalpha<span class="sy3">!</span><span class="sy1">=</span><span class="nu0">0</span></span></span> ，则下列规则替换阶段 2 和 3 ：
<ul><li> 从输入迭代器 <code>in</code> 获得匹配获得自 <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="../use_facet.html"><span class="kw1897">std::<span class="me2">use_facet</span></span></a><span class="sy1">&lt;</span><a href="../numpunct.html"><span class="kw1961">std::<span class="me2">numpunct</span></span></a><span class="sy1">&lt;</span>charT<span class="sy1">&gt;&gt;</span><span class="br0">(</span>str.<span class="me1">getloc</span><span class="br0">(</span><span class="br0">)</span><span class="br0">)</span>.<span class="me1">falsename</span><span class="br0">(</span><span class="br0">)</span></span></span> 和 <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="../use_facet.html"><span class="kw1897">std::<span class="me2">use_facet</span></span></a><span class="sy1">&lt;</span><a href="../numpunct.html"><span class="kw1961">std::<span class="me2">numpunct</span></span></a><span class="sy1">&lt;</span>charT<span class="sy1">&gt;</span> <span class="sy1">&gt;</span><span class="br0">(</span>str.<span class="me1">getloc</span><span class="br0">(</span><span class="br0">)</span><span class="br0">)</span>.<span class="me1">truename</span><span class="br0">(</span><span class="br0">)</span></span></span> 的相继字符，而且仅按需要匹配鉴别唯一匹配。仅在需要获得字符时，将输入迭代器 <code>in</code> 与 <code>end</code> 比较。
</li><li> 若目标序列为唯一匹配，则设置 <code>v</code> 为对应的 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw4">bool</span></span></span> 值。否则存储 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw2">false</span></span></span> 于 <code>v</code> 并赋值 <span class="t-lc"><a href="../../io/ios_base/iostate.html" title="cpp/io/ios base/iostate">std::ios_base::failbit</a></span> 给 <code>err</code> 。若在输入结束（ <span class="t-c"><span class="mw-geshi cpp source-cpp">in<span class="sy1">==</span>end</span></span> ）前无法找到唯一匹配，则执行 <span class="t-c"><span class="mw-geshi cpp source-cpp">err<span class="sy3">|</span><span class="sy1">=</span><a href="../../io/ios_base/iostate.html"><span class="kw1701">std::<span class="me2">ios_base</span><span class="sy4">::</span><span class="me2">eofbit</span></span></a></span></span> 。
</li></ul>
</li></ul>
<h4><span class="mw-headline" id=".E9.98.B6.E6.AE.B5_2_.EF.BC.9A.E5.AD.97.E7.AC.A6.E9.87.8A.E5.87.BA">阶段 2 ：字符释出</span></h4>
<ul><li> 若 <span class="t-c"><span class="mw-geshi cpp source-cpp">in<span class="sy1">==</span>end</span></span> ，则立即终止阶段 2 ，则不再释出更多字符
</li><li> 如同以 <span class="t-c"><span class="mw-geshi cpp source-cpp">char_type ct <span class="sy1">=</span> <span class="sy2">*</span>in<span class="sy4">;</span></span></span> 从 <span class="t-c"><span class="mw-geshi cpp source-cpp">in</span></span> 释出下个字符
<ul><li> 若字符匹配如同用 <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="../use_facet.html"><span class="kw1897">std::<span class="me2">use_facet</span></span></a><span class="sy1">&lt;</span><a href="../ctype.html"><span class="kw1938">std::<span class="me2">ctype</span></span></a><span class="sy1">&lt;</span>charT<span class="sy1">&gt;&gt;</span><span class="br0">(</span>str.<span class="me1">getloc</span><span class="br0">(</span><span class="br0">)</span><span class="br0">)</span>.<span class="me1">widen</span><span class="br0">(</span><span class="br0">)</span></span></span> 加宽到 locale 的 char_type 的 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="st0">"0123456789abcdefxABCDEFX+-"</span></span></span> 字符之一，则将它转换为对应的 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw4">char</span></span></span> 。
</li><li> 若字符匹配小数点（ <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="../use_facet.html"><span class="kw1897">std::<span class="me2">use_facet</span></span></a><span class="sy1">&lt;</span><a href="../numpunct.html"><span class="kw1961">std::<span class="me2">numpunct</span></span></a><span class="sy1">&lt;</span>charT<span class="sy1">&gt;&gt;</span><span class="br0">(</span>str.<span class="me1">getloc</span><span class="br0">(</span><span class="br0">)</span><span class="br0">)</span>.<span class="me1">decimal_point</span><span class="br0">(</span><span class="br0">)</span><span class="br0">)</span></span></span> ），则以 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="st0">'.'</span></span></span> 替换之。
</li><li> 若字符匹配千分隔符（ <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="../use_facet.html"><span class="kw1897">std::<span class="me2">use_facet</span></span></a><span class="sy1">&lt;</span><a href="../numpunct.html"><span class="kw1961">std::<span class="me2">numpunct</span></span></a><span class="sy1">&lt;</span>charT<span class="sy1">&gt;&gt;</span><span class="br0">(</span>str.<span class="me1">getloc</span><span class="br0">(</span><span class="br0">)</span><span class="br0">)</span>.<span class="me1">thousands_sep</span><span class="br0">(</span><span class="br0">)</span></span></span> ）且在所有 <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="../use_facet.html"><span class="kw1897">std::<span class="me2">use_facet</span></span></a><span class="sy1">&lt;</span><a href="../numpunct.html"><span class="kw1961">std::<span class="me2">numpunct</span></span></a><span class="sy1">&lt;</span>charT<span class="sy1">&gt;&gt;</span><span class="br0">(</span>str.<span class="me1">getloc</span><span class="br0">(</span><span class="br0">)</span><span class="br0">)</span>.<span class="me1">grouping</span><span class="br0">(</span><span class="br0">)</span>.<span class="me1">length</span><span class="br0">(</span><span class="br0">)</span> <span class="sy3">!</span><span class="sy1">=</span> <span class="nu0">0</span></span></span> 中使用千分隔，则若尚未积累小数点 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="st0">'.'</span></span></span> ，则记忆该字符的位置，但其他情况下忽略该字符。若已基类小数点，则舍弃该字符并终止阶段 2 。
</li><li> 任何情况下，检查从前一步骤获得的 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw4">char</span></span></span> 是否在会为 <span class="t-lc"><a href="../../io/c/scanf.html" title="cpp/io/c/fscanf">std::scanf</a></span> 给定阶段 1 中选择的转换指定符的输入域中得到允许。若它手允许，则将它积累到临时缓冲区并重复阶段 2 。若它不受允许，则阶段 2 终止。
</li></ul>
</li></ul>
<h4><span class="mw-headline" id=".E9.98.B6.E6.AE.B5_3_.EF.BC.9A.E8.BD.AC.E6.8D.A2.E4.B8.8E.E5.AD.98.E5.82.A8">阶段 3 ：转换与存储</span></h4>
<ul><li> 转换阶段 2 中积累的 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw4">char</span></span></span> 序列为数值
</li></ul>
 <table class="t-rev-begin">
<tr class="t-rev t-until-cxx11"><td>
<dl><dd>输入如同以 <span class="t-lc"><a href="../../io/c/scanf.html" title="cpp/io/c/fscanf">std::scanf</a></span> 带阶段 1 中选择的转换指定符分析
</dd></dl>
</td>
<td><span class="t-mark-rev t-until-cxx11">(C++11 前)</span></td></tr>
<tr class="t-rev t-since-cxx11"><td>
<dl><dd>输入如同以对有符号整数 <code>v</code> 的 <span class="t-lc"><a href="../../string/byte/strtol.html" title="cpp/string/byte/strtol">std::strtoll</a></span> 、对无符号整数 <code>v</code> 的 <span class="t-lc"><a href="../../string/byte/strtoul.html" title="cpp/string/byte/strtoul">std::strtoull</a></span> 、对 <code>float</code> <code>v</code> 的 <span class="t-lc"><a href="../../string/byte/strtof.html" title="cpp/string/byte/strtof">std::strtof</a></span> 、对 <code>double</code> <code>v</code> 的 <span class="t-lc"><a href="../../string/byte/strtof.html" title="cpp/string/byte/strtof">std::strtod</a></span> 或对 <code>long double</code> <code>v</code> 的 <span class="t-lc"><a href="../../string/byte/strtof.html" title="cpp/string/byte/strtof">std::strtold</a></span> 分析
</dd></dl>
</td>
<td><span class="t-mark-rev t-since-cxx11">(C++11 起)</span></td></tr>
</table>
 <table class="t-rev-begin">
<tr class="t-rev t-until-cxx11"><td>
<ul><li> 若出现错误，则保留 <code>v</code> 不更改。
</li></ul>
</td>
<td><span class="t-mark-rev t-until-cxx11">(C++11 前)</span></td></tr>
<tr class="t-rev t-since-cxx11"><td>
<ul><li> 若转换函数无法转换整个域，则存储值 <span class="t-c"><span class="mw-geshi cpp source-cpp">​<span class="nu0">0</span>​</span></span> 于 <code>v</code> 。
</li><li> 若转换函数产生过大而无法适合作为有符号整数类型的 <code>v</code> 类型的正值或负值，则分别存储可表示的最正值或最负值于 <code>v</code> 。
</li><li> 若转换函数产生不适合作为无符号整数类型的 <code>v</code> 类型的值，则存储可表示的最正值于 <code>v</code> 。
</li></ul>
</td>
<td><span class="t-mark-rev t-since-cxx11">(C++11 起)</span></td></tr>
</table>
<ul><li> 任何情况下，若转换函数失败，则赋值 <span class="t-lc"><a href="../../io/ios_base/iostate.html" title="cpp/io/ios base/iostate">std::ios_base::failbit</a></span> 为 <code>err</code>
</li><li> 否则，存储转换的数值结果于 <code>v</code>
<ul><li> 若 <code>v</code> 的类型为 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw4">bool</span></span></span> 且未设置 boolalpha ，则若要存储的值为 <span class="t-c"><span class="mw-geshi cpp source-cpp">​<span class="nu0">0</span>​</span></span> 则存储 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw2">false</span></span></span> ，若要存储的值为 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="nu0">1</span></span></span> 则存储 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw2">true</span></span></span> ，对于任何其他值，赋值 <span class="t-lc"><a href="../../io/ios_base/iostate.html" title="cpp/io/ios base/iostate">std::ios_base::failbit</a></span> 为 <code>err</code> 并存储 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw2">true</span></span></span> 。
</li></ul>
</li><li> 之后，检查数位分组。若阶段 2 中舍弃的任何千分隔符的位置不匹配 <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="../use_facet.html"><span class="kw1897">std::<span class="me2">use_facet</span></span></a><span class="sy1">&lt;</span><a href="../numpunct.html"><span class="kw1961">std::<span class="me2">numpunct</span></span></a><span class="sy1">&lt;</span>charT<span class="sy1">&gt;&gt;</span><span class="br0">(</span>str.<span class="me1">getloc</span><span class="br0">(</span><span class="br0">)</span><span class="br0">)</span>.<span class="me1">grouping</span><span class="br0">(</span><span class="br0">)</span></span></span> 所提供的分组，则赋值 <span class="t-lc"><a href="../../io/ios_base/iostate.html" title="cpp/io/ios base/iostate">std::ios_base::failbit</a></span> 为 <code>err</code> 。
</li><li> 若因测试 <span class="t-c"><span class="mw-geshi cpp source-cpp">in<span class="sy1">==</span>end</span></span> 终止阶段 2 ，则执行 <span class="t-c"><span class="mw-geshi cpp source-cpp">err<span class="sy3">|</span><span class="sy1">=</span><a href="../../io/ios_base/iostate.html"><span class="kw1701">std::<span class="me2">ios_base</span><span class="sy4">::</span><span class="me2">eofbit</span></span></a></span></span> 设置 eof 位。
</li></ul>
<h3><span class="mw-headline" id=".E8.BF.94.E5.9B.9E.E5.80.BC">返回值</span></h3>
<p><code>in</code>
</p>
<h3><span class="mw-headline" id=".E6.B3.A8.E8.A7.A3">注解</span></h3>
<p>C++98/C++03 中，若出现错误，则保留 <code>v</code> 不更改。 C++11 中，它被设为上述的值。 
</p><p>转换负整数字符串为无符号整数时，某些实现产生零（因为字符串所表示的值小于目标类型所能表示的）。这种行为曾被 C++11/14 标准指定，但被 <a rel="nofollow" class="external text" href="https://cplusplus.github.io/LWG/issue1169">LWG #1169</a> 更正。
</p><p>因为阶段 2 滤出如 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="st0">'p'</span></span></span> 、 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="st0">'N'</span></span></span> 或 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="st0">'i'</span></span></span> 的字符，如 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="st0">"0x1.23p-10"</span></span></span> 的十六进制浮点数和字符串 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="st0">"NaN"</span></span></span> 或 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="st0">"inf"</span></span></span> 可能为 <code>do_get(double)</code> 所拒绝，即使它们它们是对 <code>strtod</code> 的合法输入：此为 <a rel="nofollow" class="external text" href="https://cplusplus.github.io/LWG/issue2381">LWG #2381</a> 。
</p>
<h3><span class="mw-headline" id=".E7.A4.BA.E4.BE.8B">示例</span></h3>
<div class="t-example"><p>用户定义类型的 <span class="t-lc">operator&gt;&gt;</span> 实现。</p><div class="t-example-live-link"><div class="coliru-btn coliru-btn-run-init">运行此代码</div></div>
<div dir="ltr" class="mw-geshi" style="text-align: left;"><div class="cpp source-cpp"><pre class="de1"><span class="co2">#include &lt;iostream&gt;</span>
<span class="co2">#include &lt;iterator&gt;</span>
<span class="co2">#include &lt;locale&gt;</span>
 
<span class="kw1">struct</span> base <span class="br0">{</span> <span class="kw4">long</span> x<span class="sy4">;</span> <span class="br0">}</span><span class="sy4">;</span>
 
<span class="kw1">template</span> <span class="sy1">&lt;</span><span class="kw1">class</span> CharT, <span class="kw1">class</span> Traits<span class="sy1">&gt;</span>
<a href="../../io/basic_istream.html"><span class="kw1713">std::<span class="me2">basic_istream</span></span></a><span class="sy1">&lt;</span>CharT, Traits<span class="sy1">&gt;</span><span class="sy3">&amp;</span>
    operator <span class="sy1">&gt;&gt;</span><span class="br0">(</span><a href="../../io/basic_istream.html"><span class="kw1713">std::<span class="me2">basic_istream</span></span></a><span class="sy1">&lt;</span>CharT, Traits<span class="sy1">&gt;</span><span class="sy3">&amp;</span> is,
                base<span class="sy3">&amp;</span> b<span class="br0">)</span>
<span class="br0">{</span>
    <a href="../../io/ios_base/iostate.html"><span class="kw1697">std::<span class="me2">ios_base</span><span class="sy4">::</span><span class="me2">iostate</span></span></a> err <span class="sy1">=</span> <a href="../../io/ios_base/iostate.html"><span class="kw1698">std::<span class="me2">ios_base</span><span class="sy4">::</span><span class="me2">goodbit</span></span></a><span class="sy4">;</span>
    <span class="kw1">try</span> <span class="co1">// 设置 err 为能抛出</span>
    <span class="br0">{</span>
        <span class="kw1">typename</span> <a href="../../io/basic_istream.html"><span class="kw1713">std::<span class="me2">basic_istream</span></span></a><span class="sy1">&lt;</span>CharT, Traits<span class="sy1">&gt;</span><span class="sy4">::</span><span class="me2">sentry</span> s<span class="br0">(</span>is<span class="br0">)</span><span class="sy4">;</span>
 
        <span class="kw1">if</span> <span class="br0">(</span>s<span class="br0">)</span> <span class="co1">// 若流已为输入就绪</span>
        <span class="br0">{</span>
            <a href="../use_facet.html"><span class="kw1897">std::<span class="me2">use_facet</span></span></a><span class="sy1">&lt;</span><a href="../num_get.html"><span class="kw1955">std::<span class="me2">num_get</span></span></a><span class="sy1">&lt;</span>CharT<span class="sy1">&gt;&gt;</span><span class="br0">(</span>is.<span class="me1">getloc</span><span class="br0">(</span><span class="br0">)</span><span class="br0">)</span>.<span class="me1">get</span><span class="br0">(</span>is, <span class="br0">{</span><span class="br0">}</span>, is, err, b.<span class="me1">x</span><span class="br0">)</span><span class="sy4">;</span>
        <span class="br0">}</span>
    <span class="br0">}</span> <span class="kw1">catch</span><span class="br0">(</span><a href="../../io/ios_base/failure.html"><span class="kw1670">std::<span class="me2">ios_base</span><span class="sy4">::</span><span class="me2">failure</span></span></a><span class="sy3">&amp;</span> error<span class="br0">)</span>
    <span class="br0">{</span>
        <span class="co1">// 处理异常</span>
    <span class="br0">}</span>
    <span class="kw1">return</span> is<span class="sy4">;</span>
<span class="br0">}</span>
 
<span class="kw4">int</span> main<span class="br0">(</span><span class="br0">)</span>
<span class="br0">{</span>
    base b<span class="sy4">;</span>
 
    <a href="../../io/cin.html"><span class="kw1756">std::<span class="me2">cin</span></span></a> <span class="sy1">&gt;&gt;</span> b<span class="sy4">;</span>
<span class="br0">}</span></pre></div></div>
<p><br> 
</p>
</div>
<h3><span class="mw-headline" id=".E5.8F.82.E9.98.85">参阅</span></h3>
<table class="t-dsc-begin">

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="../../io/basic_istream/operator_gtgt.html" title="cpp/io/basic istream/operator gtgt"> <span class="t-lines"><span>operator&gt;&gt;</span></span></a></div></div>
</td>
<td>  提取带格式数据 <br> <span class="t-mark">(<code>std::basic_istream&lt;CharT,Traits&gt;</code> 的公开成员函数)</span> </td></tr>
</table>

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